Word Count : 197

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To derive the relationship between \( \Delta_r U \) (change in internal energy) and \( \Delta_r H \) (change in enthalpy), let's first recall the definitions of internal energy \( U \) _________ _______ _________ _____ _____ ______ _____ ______ ______ ________.
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_______ ________ ____.
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